Abstract
In this paper, the XPS depth profiling results of passive surface layers formed on nickel–chromium AISI 304L and nickel–chromium–molybdenum AISI 316L austenitic stainless steels after a standard electropolishing at current density of 50A/dm2 (EP50), and after a high current density electropolishing at 1000A/dm2 (EP1000) in the mixture of sulfuric/orthophosphoric acids electrolyte in the following proportions H3PO4:H2SO4=1:4 and 4:1 are presented. The results have shown, that in case of nickel–chromium austenitic stainless steel (AISI 304L) there were no detected significant differences in the chemical composition of the passive layer formed after EP50 and EP1000 electrochemical treatments. In the passive layer of nickel–chromium–molybdenum austenitic stainless steel, the chromium and molybdenum enrichment was noted after EP1000 electropolishing, but was not observed after EP50 operation.
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